FAG36620-BTapered roller bearing single flanged cup – 7.6250 in OD, 0.9063 in width, 7.7772 in flange OD, inch series, case-carburized steel

Product Description

What this part is:

The 36620-B is a single flanged cup for an inch-series tapered roller bearing — the outer race on its own, with an integral flange machined on the outside diameter at one end. Outside diameter is 7.6250 in (193.675 mm) and outer ring width is 0.9063 in (23.020 mm). The flange stands proud of that diameter at 7.7772 in (197.541 mm) over a flange width of 0.1563 in (3.97 mm).

Quantity and configuration:

Cup only. The matching cone is the 36690.

Decoding the designation:

In Timken inch-series nomenclature the 36620 number identifies this specific cup raceway and outside diameter. The B suffix marks the flanged version of that cup, which Timken classes as a TSF bearing when it is paired with its cone. The number is written variously as 36620B, 36620-B and K-36620-B across cartons and catalogues, all referring to the same race.

Flange function and housing fit:

A flanged cup locates itself axially against the machined face of a through-bored housing rather than needing an internal shoulder, so the housing can be bored straight through at one diameter. That simplifies manufacture, makes the cup accessible for removal from the outside, and gives a repeatable reference face for aligning a seal. The housing backing shoulder diameter at the front face is 7.50 in (190.5 mm) and the largest housing fillet radius the cup corner will clear is 0.06 in (1.5 mm).

What these specs mean in practice:

The published K factor of 1.59 is the ratio of radial to thrust rating for this raceway geometry, and the e factor of 0.37 sets the load ratio at which the thrust component begins to govern. A K factor near 1.6 marks a shallow contact angle, so this geometry is biased towards radial capacity with thrust taken as a secondary component — the usual choice for heavily loaded gearbox and pinion positions rather than for a predominantly axial duty.

Material and construction:

Case-carburized alloy steel, through-ground raceway, with the tough core and hard case that give tapered roller races their resistance to shock and edge loading. Weight is 5.4 lb (2.5 kg).

Fitting notes:

The cup is pressed square into the housing bore with the flange face seating against the machined housing face. Force is applied evenly around the cup back face, and the raceway taper faces towards the cone. Running setting is established afterwards by axial adjustment of the cone against the opposing bearing.

Interchange guidance:

Cross-references for the same flanged cup are Timken 36620-B, SKF 36620/B and Koyo 36620B. The plain 36620 is the same raceway without the flange and locates on a housing shoulder instead, which makes it a related size rather than a substitution. On the cone side, 36690 gives a 5.7500 in bore and 36686 gives 5.6250 in, both running against this cup.